Comparison of fractal characteristics of postural control mechanisms for different conditions of sensor control.
Abstract
Comparison of fractal characteristics of postural control mechanisms for different conditions of sensor control.
Incoming article date: 21.10.2015This study analyses fractal characteristics of open-loop and closed-loop control mechanisms for different conditions of the sensor control. The stabilogram acquired using three types of the sensor control: open eyes (OE), closed eyes (CE) and visual artificial feedback (VAF). To determine the difference in control mechanisms for different condition of sensor control we have applied the method, offered by Collins J.J. and De Luca C.J. This method is based on the calculation of the Hurst exponent. We did not reveal significant differences (p>0,05) for control mechanisms between OE and CE parameters. However, there were significant differences for control mechanisms between VAF and OE parameters. We revealed that VAF reinforces open-loop and closed loop control mechanisms in anteroposterior directions, as well as VAF reinforces closed-loop control mechanisms in mediolateral directions. It may be important, in a rehabilitation setting, to identify which one of the two components of postural control (open loop or closed loop) needs more reinforcement in a particular patient, and consequently design an optimized device to improve postural balance.
Keywords: fractal analysis, Hurst exponent, open-loop, closed-loop, artificial feedback, analysis of stabilogram, postural control